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Geocon will retain Cascade Drilling (C574 938110) and McMillan's Well Service, LLC. for the well destruction activities. Prior to destruction activities, the pump assembly will be removed and disposed of properly. The field staff will note the material of the casing, measure the diameter of the well; depth to groundwater, and total depth of the well. Measurements will be used to confirm specifications for wells that have well construction records. Measurements from wells with unknown specifications will be used to create well specifications. At each well, Cascade will perforate the well casing using depth -discrete explosive charges packed with projectiles. Explosive charges connected to detonating cord will be placed from the bottom of each well casing to the surface at 10 -foot intervals. After the explosive charges are placed, a neat cement grout will be pumped into each well to the surface with tremie pipe. When the grout level stabilizes in each well, the charges will be detonated perforating the well casing and permitting neat cement to enter into the formation. Following blast perforation, additional grout will be added to each well as necessary. The following table summarizes the approximate amount of explosives and grout required for each well. Well ID 495 __......... I.............I 11717 17737 17821 17904 17926 17933 17950 17793 17850 17883 17899 ........................... 17911 2145 Estimated Amount of Charges Required 1 charge per 10 feet of well 5.8 gallons of grout per depth cubic foot of well volume Geocon Project No S1358-03-05 - 2 - June 13, 2019 Estimated Diameter Total Depth (en) (ft bgs) 8 - .._._.._ __ _--......_ 175 _..-.................. ................_........... . _6 __. 170 ............................. ............ __------- ... 6 _...... . ...................................................................... -- - ....... ........ 55 6 ............. --.I .....................-- 115 ._ ------ ....................... _.._...... 5.5 ---.... .... ................... _._ 69.6 ............. _............ .._...... _.... ........ _... 4.75 69 5.5 - ._..._ ..... ............... _ _.... . 83 ....... ... _ ............._.....__._........ 6 59 Unknown Unknown ............ .I........... Unknown Unknown Unknown Unknown UIIknoWII Unlulown Unknown _.....I ......... ............_.. Unknown ._._............. _......... _.... _......... Unknown Unknown Estimated Amount of Charges Required 1 charge per 10 feet of well 5.8 gallons of grout per depth cubic foot of well volume Geocon Project No S1358-03-05 - 2 - June 13, 2019